The idling system is malfunctioning and the most common cause is a dirty throttle body, IAC and idling speed out of adjustment.
What you did was the wrong way to increase the idling speed as the throttle cable can vary in length depending on the condition thereby the idling would be erratic. At top of throttle body there is a recessed hole with a slotted screw, turning it anticlockwise would increase the idling speed.
Have the items listed cleaned and idling speed readjusted to rectify.
Is the Check Engine Light indicating?
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Sunday, February 19th, 2017 AT 2:16 PM